New in version 1.1.
Change chromatic_pitch_class_name to diatonic pitch-class name / alphabetic accidental abbreviation pair:
abjad> pitchtools.chromatic_pitch_class_name_to_diatonic_pitch_class_name_alphabetic_accidental_abbreviation_pair('cs')
('c', 's')
Return pair of strings.
Changed in version 2.0: renamed pitchtools.name_to_letter_accidental() to pitchtools.chromatic_pitch_class_name_to_diatonic_pitch_class_name_alphabetic_accidental_abbreviation_pair().